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Deep purple lisianthus in full flower, ruffled petals catching the light, with cream and apricot behind.

Lisianthus Arena Purple

Eustoma grandiflorum

Deep purple double flowers, several opening in turn up each stem. One of the longest lasting cut flowers.

OPEN POLLINATED SEEDS, NOT PELLETED

Size

Ships across Canada, or local pickup available

Growing

Life cycle
tender perennial
Sun
Full sun
Direct sow
Not recommended
Start indoors
12 to 13 weeks before last frost
Sowing depth
Not covered
Germination
10 to 15 days at 20 to 22°C (68 to 72°F)
Plant spacing
10 to 20 cm (4 to 8 in)
Mature height
30 to 86 cm (12 to 34 in)
Spread
23 to 30 cm (9 to 12 in)
Support
Benefits from support
Days to maturity
155 to 165 days
Vase life
10 to 15 days

Rich purple double flowers with a slight sheen, several opening in turn up each stem. Slow to grow from seed, but well worth the wait. Very long lasting once cut. This seed was saved from my own Arena Purple plants. The parents are hybrids, so saved seed won't come back exactly the same. Expect some change in colour and fullness. Mine have come close so far. Lisianthus seed is like dust, so there's no seed count. A packet is one level 1/16 teaspoon pinch spoon.

Sowing and starting

Lisianthus is slow. Sow it 12 to 13 weeks before you plant out. Press the seed onto a fine, damp mix and don't cover it, since it needs light to sprout. A light dusting of vermiculite is fine. It comes up in 10 to 15 days at 20 to 22°C (68 to 72°F).

The seedlings stay tiny for weeks. That's normal, so don't give up on the tray. Keep them under good light and never let them dry out. Once they have four or five leaves, move them into deep cells, since they grow a long root early. Don't sow it straight into the garden.

Care

Plant 10 to 20 cm (4 to 8 in) apart in full sun, in well-drained soil with plenty of compost. The stems grow 30 to 86 cm (12 to 34 in) long. It flowers late in the season. It benefits from support. If you're growing a lot of plants, Hortonova netting works best, laid 30 to 46 cm (12 to 18 in) above the bed.

When to cut

I recommend cutting off the first bloom and letting the second and third open. Often another bud or two will open.

In the vase

Keep it in a cool room. It lasts even longer if it can sit somewhere around 2 to 5°C (36 to 41°F) overnight.

When cutting a bouquet, strip any leaves that would sit under water. They turn the water murky fast. Change the water every few days for the longest lasting bouquet. As flowers fade, you can remove them and rearrange the remaining flowers.

  • Good for cutting